Finding the Third Proportional to 4,566,978 and 9,822,857

Step by Step Solution

1. Step 1: Write the proportion equation
   4,566,978 : 9,822,857 = 9,822,857 : x
2. Step 2: Convert to fraction form
   4,566,978/9,822,857 = 9,822,857/x
3. Step 3: Cross multiply
   4,566,978x = 9,822,857 × 9,822,857
4. Step 4: Simplify right side
   4,566,978x = 96,488,519,642,449
5. Step 5: Solve for x
   x = 96,488,519,642,449/4,566,978
6. Step 6: Final answer
   x = 21,127,432.55